论文部分内容阅读
航天部某特种铝合金壳体零件(见图1),要求表面光洁(6以上)、尺寸公差小(按QJ169——751级)、形状复杂、壁薄(最小壁厚为1mm)、冶金质量严、铸件上不允许有冷隔、裂纹、欠铸、通孔和穿透针孔等缺陷。为此铸件100％进行X光探伤,铸件针孔度不超过标准2级。 由于上述特点该零件不能采用压铸、金属型,而选用熔模铸造方法。
Aerospace Department of a special aluminum alloy shell parts (see Figure 1), requiring a smooth surface (6 or more), small size tolerances (by QJ169--751 level), complex shape, thin wall (minimum wall thickness of 1mm), metallurgical quality Yan, the castings are not allowed to have a cold, cracks, owe cast, through holes and penetrate pinholes and other defects. For this casting 100% X-ray detection, casting pinhole does not exceed the standard 2 level. Due to the above characteristics of the parts can not be used die-casting, metal type, and the choice of investment casting method.